Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A display apparatus comprising: a display configured to display an image; a backlight unit (BLU) comprising a plurality of light sources configured to emit light to a screen of the display; an image processor configured to: divide an input image into a plurality of blocks, identify a target brightness for each block based on brightness of the input image corresponding to each block, identify priority of the plurality of light sources corresponding to the plurality of blocks in an order of the target brightness, and adjust a control value of each of the plurality of light sources based on the identified target brightness for each block, wherein the control value of a first light source having a higher priority is adjusted prior to a second light source having a lower priority; and a driver configured to drive the plurality of light sources based on the adjusted control values, wherein the images processor is further configured to: adjust the control value for each of the plurality of light sources based on the priority, and then adjust the control value for each of the plurality of light sources and light sources adjacent thereto based on the priority, and adjust the control value for each of the plurality of light sources, based on a control value of a current light source, a brightness difference value of a block, which has a largest difference from the target brightness with the BLU being driven by the control value of the current light source, among blocks included in an area of which each of the plurality of light sources is in charge, and a rate of making light travel from each of the plurality of light sources to the block.
A display apparatus improves image quality by dynamically adjusting backlight unit (BLU) brightness based on localized image content. The apparatus includes a display, a BLU with multiple light sources, an image processor, and a driver. The image processor divides an input image into blocks and determines a target brightness for each block. It prioritizes the light sources based on the target brightness of their corresponding blocks, adjusting higher-priority light sources first. The processor then refines control values for each light source and its adjacent sources, considering priority. Additionally, it adjusts control values based on the current light source's value, the brightness difference between the target and actual brightness of the block with the largest discrepancy, and the light diffusion rate from the light source to that block. The driver then drives the light sources according to the adjusted control values. This approach enhances brightness accuracy and reduces power consumption by optimizing backlight control in a hierarchical manner, ensuring higher-priority areas receive precise illumination while minimizing unnecessary adjustments.
2. The display apparatus according to claim 1 , wherein the priority of each of the plurality of light sources is varied depending on a target brightness value of the block included in the area of which each of the plurality of light sources is in charge.
3. The display apparatus according to claim 1 , wherein the image processor adjusts the control values for each of the plurality of light sources and light sources adjacent thereto, based on the control value of the current light source, the brightness difference value of the block, which has the largest difference from the target brightness with the BLU being driven by the control value of the current light source, among the blocks included in the area of which each of the plurality of light sources is in charge, and the rate of making the light travel from each of the plurality of light sources and light sources adjacent thereto to the block.
4. The display apparatus according to claim 1 , wherein the control value for each of the plurality of light sources is adjusted once or iteratively a predetermined number of times.
5. The display apparatus according to claim 1 , wherein the control values for each of the plurality of light sources and light sources adjacent thereto are adjusted once or iteratively a predetermined number of times.
6. The display apparatus according to claim 1 , wherein the target brightness is identified based on a weighted sum of a maximum pixel value and an average pixel value in the block.
7. The display apparatus according to claim 1 , wherein the image processor estimates brightness according to pixels of the input image based on the adjusted control values, and compensates pixel data of the input image based on the estimated brightness.
8. A method of controlling a display apparatus, the method comprising: dividing an input image into a plurality of blocks; identifying a target brightness for each block based on brightness of the input image corresponding to each block; identify priority of a plurality of light sources that constitute a backlight unit (BLU), corresponding to the plurality of blocks in an order of the target brightness; adjusting a control value of each of the plurality of light sources based on the identified target brightness for each block, wherein the control value of a first light source having a higher priority is adjusted prior to a second light source having a lower priority; and driving the plurality of light sources to emit light to a display screen based on the adjusted control values, wherein the adjusting the control value of each of the plurality of light sources further comprises: adjusting the control value for each of the plurality of light sources based on the priority, and then adjust the control value for each of the plurality of light sources and light sources adjacent thereto based on the priority, and adjusting the control value for each of the plurality of light sources, based on a control value of a current light source, a brightness difference value of a block, which has a largest difference from the target brightness with the BLU being driven by the control value of the current light source, among blocks included in an area of which each of the plurality of light sources is in charge, and a rate of making light travel from each of the plurality of light sources to the block.
9. The method according to claim 8 , wherein the priority of each of the plurality of light sources is varied depending on a target brightness value of the block included in the area of which each of the plurality of light sources is in charge.
10. The method according to claim 8 , wherein the adjusting the control value for each of the plurality of light sources and light sources adjacent thereto further comprises adjusting control values for each of the plurality of light sources and light sources adjacent thereto, based on the control value of the current light source, the brightness difference value of the block, which has the largest difference from the target brightness with the BLU being driven by the control value of the current light source, among the blocks included in the area of which each of the plurality of light sources is in charge, and the rate of making the light travel from each of the plurality of light sources and light sources adjacent thereto to the block.
11. The method according to claim 8 , wherein the target brightness is identified based on a weighted sum of a maximum pixel value and an average pixel value in the block, and the method further comprising: estimating brightness according to pixels of the input image based on the adjusted control values; and compensating pixel data of the input image based on the estimated brightness.
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February 2, 2021
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